When you try to install NFS Server Roles on Windows Server 2016 by using server manager, you were not able to. The system keeps requesting you to restart the server. [Pending restart]
But restart the server still does not allow you to install NFS Server roles.
This may be due to other application is using same port 111. Example:- Veeam vPower NFS Service
[ Resolution ]
1. Temporary disable the Veeam vPower NFS Service services
2. Install NFS Server Roles using Server Manager
3. Restart Veeam vPower NFS Service
That should do the trick!